In the context of vision, what does accommodation mean?

a. lack of receptor response to continued light signal
b. changing the lens shape
c. moving the lens closer to or further away from the retina in order to focus the image
d. keeping the lens under tension to allow for image focusing
e. preventing light from scattering upon entry to the eye


B

Biology & Microbiology

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__________, or four-legged walkers, evolved from lobe-finned bony fishes. Fill in the blank(s) with the appropriate word(s)

Fill in the blank(s) with the appropriate word(s).

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Net primary productivity is the

a. rate of photosynthesis. b. rate of energy flow. c. amount of energy stored in the ecosystem. d. amount of energy utilized. e. amount of energy stored in the plant tissue in excess of that used by autotrophs in respiration.

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Which of the following is most likely to be the source of most of the oxygen in the atmosphere?

A) weathering of rocks B) UV radiation C) photosynthesis D) macroevolution

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Both DNA and RNA are made up of building blocks known as

A. codons. B. amino acids. C. nucleotides. D. nucleic acids. E. genes.

Biology & Microbiology